Add rate limiting to SMS
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@ -4,6 +4,7 @@
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This module provides ".text-<name> <message>" commands that send SMS messages
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via the Twilio api.
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Config
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------
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@ -19,6 +20,11 @@ Config
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"guy1": "+11111111111",
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"guy2": "+12222222222"
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},
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"limit": {
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"enable": true,
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"period": 900,
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"max": 5
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}
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}
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.. cmdoption:: account_sid
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@ -45,6 +51,19 @@ Config
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Dict of names to phone numbers. Names must be a-zA-Z0-9 and numbers match the format shown above.
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.. cmdoption:: limit.enable
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Enable or disable rate limiting. Rate limiting is controlled as a "burst bucket." If enabled, sending an SMS
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requires 1 and removes one point from the bucket.
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.. cmdoption:: limit.period
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Every `limit.period`, a virtual point is added to the bucket.
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.. cmdoption:: limit.max
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When adding a point the bucket, the point will be discarded if the bucket already has `limit.max` points.
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Twilio Setup
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------------
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@ -56,6 +75,7 @@ URL.
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The webhook listener listens on `/app/gotsms`, so an example webhook URL would
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be `http://1.2.3.4:3000/app/gotsms`.
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Class Reference
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---------------
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@ -7,5 +7,10 @@
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"contacts": {
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"guy1": "+11111111111",
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"guy2": "+12222222222"
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},
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"limit": {
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"enable": true,
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"period": 900,
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"max": 5
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}
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}
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@ -5,6 +5,8 @@
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:synopsis: SMS client script (requires Twilio account)
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"""
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from time import time
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from math import floor
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from pyircbot.modulebase import ModuleBase, regex
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import cherrypy
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from threading import Thread
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@ -62,6 +64,39 @@ class SMS(ModuleBase):
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self.apithread = None
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self.twilio = Client(self.config["account_sid"], self.config["auth_token"])
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# limit-related vars
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# How many messages can be bursted
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self.bucket_max = int(self.config["limit"]["max"])
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# burst bucket, initial value is 1 or half the max, whichever is more
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self.bucket = max(1, self.bucket_max / 2)
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# how often the bucket has 1 item added
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self.bucket_period = int(self.config["limit"]["period"])
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# last time the burst bucket was filled
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self.bucket_lastfill = int(time())
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def check_rate_limit(self):
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"""
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Rate limiting via a 'burst bucket'. This method is called before sending and returns true or false depending on
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if the action is allowed.
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"""
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# First, update the bucket
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# Check if $period time has passed since the bucket was filled
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since_fill = int(time()) - self.bucket_lastfill
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if since_fill > self.bucket_period:
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# How many complete points are credited
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fills = floor(since_fill / self.bucket_period)
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self.bucket += fills
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if self.bucket > self.bucket_max:
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self.bucket = self.bucket_max
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# Advance the lastfill time appropriately
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self.bucket_lastfill += self.bucket_period * fills
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if self.bucket >= 1:
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self.bucket -= 1
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return True
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return False
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def api(self):
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"""
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Run the webhook listener and block
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@ -113,6 +148,11 @@ class SMS(ModuleBase):
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if contact not in self.config["contacts"].keys():
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return # TODO invalid contact
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if self.config["limit"]["enable"]:
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if not self.check_rate_limit():
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self.bot.act_PRIVMSG(msg.args[0], "Sorry, try again later")
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return
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try:
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self.twilio.api.account.messages.create(to=self.config["contacts"][contact],
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from_=self.config["number"],
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